Defender of the Crown is a strategy game released for several platforms, including the NES. It blends strategy, role-playing, and adventure elements.  Players are feudal lords participating in medieval warfare.  The NES version offers a strategic experience with turn-based combat and potentially simplified graphics and controls compared to other versions.  Its developer and publisher may vary depending on the region.

Defender of the Crown (Europe)

Deep Dungeon 4 - Kuro no Youjutsushi (Japan)